The production method of viscose negative ion fiber mainly includes preparation of negative ion micropowder, the negative ion mineral material is undergone the processes of screening, washing, crushing, removing dust, removing impurity and pulverizing to obtain negative ion micropowder whose fineness is D50 0.5 micrometer. The production method includes: dispersing the negative ion micropowder and dispersing agent into water according to the ratio of 1:10, fully stirring to form negative ion water emulsion slurry, after the alkali cellulose is sulfonated, in the dissolving process uniformly adding the obtained negative ion water emulsion slurry into viscose, fully stirring and grinding to obtain viscose spinning liquid, filtering and spinning under the condition of specific acid bath, washing and drying.